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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc19518eb176d8ef6170e5eea203d439d2ece0fb9ede3963756c805c845c54f8' 
  AND token = '/OA86mSYTZIPGE5Z1xNKuW/gNwpExAUv/tMW0kXLLJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}